| 摘要 |
PROBLEM TO BE SOLVED: To provide a screw for osteotomy having a recessed section into which a rotary tool is inserted and which can be worked easily and is formed to prevent breakage and serious deformation. SOLUTION: The screw 10 for osteotomy has a threaded part and a head part 12 provided with the recessed section 12a which accepts the rotary tool having a polygonal cross section and receives the rotational force of the tool. The recessed section 12a has a hole cross-sectional form in which a plurality of inwardly curved circular-arcuate parts 12b are provided around its axial line and, at the same time, acuminated parts 12c protruded centripetally are constituted of mutually intersecting adjacent circular-arcuate parts. The acuminated part 12c is constituted in a plastically deformable state. COPYRIGHT: (C)2004,JPO&NCIPI
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